i tested this new version of CollectionsManager on a kindle kv (5.8.5.0.1) and get a crash.
This is the crash.log file content :
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[04/11/16 18:28] Collections Manager (v. 2.8.1)
java.lang.RuntimeException: java.lang.NoSuchMethodError: com.amazon.kindle.content.catalog.B.mNB(Ljava/lang/String;Ljava/lang/String

Lcom/amazon/kindle/content/catalog/L;
at com.mobileread.ixtab.collman.CollectionsManagerKin dlet.showAndQuit(CollectionsManagerKindlet.java:10 7)
at com.mobileread.ixtab.collman.CollectionsManagerKin dlet.initUiAfterSplash(CollectionsManagerKindlet.j ava:99)
at com.mobileread.ixtab.collman.CollectionsManagerKin dlet.access$300(CollectionsManagerKindlet.java:20)
at com.mobileread.ixtab.collman.CollectionsManagerKin dlet$1$1.run(CollectionsManagerKindlet.java:54)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventQueueProxy.dispatchEvent(Unknown Source)
at java.awt.AGUIEventDispatchThread.pumpOneEventForHi erarchy(Unknown Source)
at java.awt.AGUIEventDispatchThread.pumpEventsForHier archy(Unknown Source)
at java.awt.AGUIEventDispatchThread.pumpEvents(Unknow n Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.NoSuchMethodError: com.amazon.kindle.content.catalog.B.mNB(Ljava/lang/String;Ljava/lang/String

Lcom/amazon/kindle/content/catalog/L;
at com.mobileread.ixtab.collman.adapters.fw585.Predic ateFactoryAdapter585.equals(PredicateFactoryAdapte r585.java:46)
at com.mobileread.ixtab.collman.adapters.PredicateFac tory.equals(PredicateFactory.java:24)
at com.mobileread.ixtab.collman.actions.sync.LegacyIm porter.<clinit>(LegacyImporter.java:31)
at com.mobileread.ixtab.collman.actions.LegacyImporte rAction.<init>(LegacyImporterAction.java:15)
at com.mobileread.ixtab.collman.ui.menu.SyncMenu.<ini t>(SyncMenu.java:20)
at com.mobileread.ixtab.collman.ui.menu.MainMenu.getI tems(MainMenu.java:27)
at com.mobileread.ixtab.collman.ui.menu.KindletMenu.s etActive(KindletMenu.java:45)
at com.mobileread.ixtab.collman.ui.menu.KindletMenu.s etActive(KindletMenu.java:33)
at com.mobileread.ixtab.collman.ui.menu.KindletMenu.i nstantiate(KindletMenu.java:21)
at com.mobileread.ixtab.collman.CollectionsManager.ad dMenu(CollectionsManager.java:70)
at com.mobileread.ixtab.collman.CollectionsManager.<i nit>(CollectionsManager.java:31)
at com.mobileread.ixtab.collman.adapters.fw585.Collec tionManager585.<init>(CollectionManager585.java:18 )
at com.mobileread.ixtab.collman.adapters.fw585.Adapte rConfiguration585.getCollectionManager(AdapterConf iguration585.java:30)
at com.mobileread.ixtab.collman.CollectionsManagerKin dlet.initUiAfterSplash(CollectionsManagerKindlet.j ava:73)
at com.mobileread.ixtab.collman.CollectionsManagerKin dlet.access$300(CollectionsManagerKindlet.java:20)
at com.mobileread.ixtab.collman.CollectionsManagerKin dlet$1$1.run(CollectionsManagerKindlet.java:54)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventQueueProxy.dispatchEvent(Unknown Source)
at java.awt.AGUIEventDispatchThread.pumpOneEventForHi erarchy(Unknown Source)
at java.awt.AGUIEventDispatchThread.pumpEventsForHier archy(Unknown Source)
at java.awt.AGUIEventDispatchThread.pumpEvents(Unknow n Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)